2 * linux/drivers/mfd/mcp-sa11x0.c
4 * Copyright (C) 2001-2005 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License.
10 * SA11x0 MCP (Multimedia Communications Port) driver.
12 * MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
14 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/spinlock.h>
20 #include <linux/platform_device.h>
22 #include <linux/mfd/mcp.h>
24 #include <mach/hardware.h>
25 #include <asm/mach-types.h>
26 #include <linux/platform_data/mfd-mcp-sa11x0.h>
28 #define DRIVER_NAME "sa11x0-mcp"
37 /* Register offsets */
38 #define MCCR0(m) ((m)->base0 + 0x00)
39 #define MCDR0(m) ((m)->base0 + 0x08)
40 #define MCDR1(m) ((m)->base0 + 0x0c)
41 #define MCDR2(m) ((m)->base0 + 0x10)
42 #define MCSR(m) ((m)->base0 + 0x18)
43 #define MCCR1(m) ((m)->base1 + 0x00)
45 #define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
48 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
50 struct mcp_sa11x0 *m = priv(mcp);
54 m->mccr0 &= ~0x00007f00;
55 m->mccr0 |= divisor << 8;
56 writel_relaxed(m->mccr0, MCCR0(m));
60 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
62 struct mcp_sa11x0 *m = priv(mcp);
66 m->mccr0 &= ~0x0000007f;
68 writel_relaxed(m->mccr0, MCCR0(m));
72 * Write data to the device. The bit should be set after 3 subframe
73 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
74 * We really should try doing something more productive while we
78 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
80 struct mcp_sa11x0 *m = priv(mcp);
84 writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));
86 for (i = 0; i < 2; i++) {
87 udelay(mcp->rw_timeout);
88 if (readl_relaxed(MCSR(m)) & MCSR_CWC) {
95 printk(KERN_WARNING "mcp: write timed out\n");
99 * Read data from the device. The bit should be set after 3 subframe
100 * times (each frame is 64 clocks). We wait a maximum of 6 subframes.
101 * We really should try doing something more productive while we
105 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
107 struct mcp_sa11x0 *m = priv(mcp);
111 writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));
113 for (i = 0; i < 2; i++) {
114 udelay(mcp->rw_timeout);
115 if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
116 ret = readl_relaxed(MCDR2(m)) & 0xffff;
122 printk(KERN_WARNING "mcp: read timed out\n");
127 static void mcp_sa11x0_enable(struct mcp *mcp)
129 struct mcp_sa11x0 *m = priv(mcp);
132 m->mccr0 |= MCCR0_MCE;
133 writel_relaxed(m->mccr0, MCCR0(m));
136 static void mcp_sa11x0_disable(struct mcp *mcp)
138 struct mcp_sa11x0 *m = priv(mcp);
140 m->mccr0 &= ~MCCR0_MCE;
141 writel_relaxed(m->mccr0, MCCR0(m));
147 static struct mcp_ops mcp_sa11x0 = {
148 .set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
149 .set_audio_divisor = mcp_sa11x0_set_audio_divisor,
150 .reg_write = mcp_sa11x0_write,
151 .reg_read = mcp_sa11x0_read,
152 .enable = mcp_sa11x0_enable,
153 .disable = mcp_sa11x0_disable,
156 static int mcp_sa11x0_probe(struct platform_device *dev)
158 struct mcp_plat_data *data = dev_get_platdata(&dev->dev);
159 struct resource *mem0, *mem1;
160 struct mcp_sa11x0 *m;
167 mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
168 mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
172 if (!request_mem_region(mem0->start, resource_size(mem0),
178 if (!request_mem_region(mem1->start, resource_size(mem1),
184 mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
190 mcp->owner = THIS_MODULE;
191 mcp->ops = &mcp_sa11x0;
192 mcp->sclk_rate = data->sclk_rate;
195 m->mccr0 = data->mccr0 | 0x7f7f;
196 m->mccr1 = data->mccr1;
198 m->base0 = ioremap(mem0->start, resource_size(mem0));
199 m->base1 = ioremap(mem1->start, resource_size(mem1));
200 if (!m->base0 || !m->base1) {
205 platform_set_drvdata(dev, mcp);
208 * Initialise device. Note that we initially
209 * set the sampling rate to minimum.
211 writel_relaxed(-1, MCSR(m));
212 writel_relaxed(m->mccr1, MCCR1(m));
213 writel_relaxed(m->mccr0, MCCR0(m));
216 * Calculate the read/write timeout (us) from the bit clock
217 * rate. This is the period for 3 64-bit frames. Always
218 * round this time up.
220 mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
223 ret = mcp_host_add(mcp, data->codec_pdata);
232 release_mem_region(mem1->start, resource_size(mem1));
234 release_mem_region(mem0->start, resource_size(mem0));
239 static int mcp_sa11x0_remove(struct platform_device *dev)
241 struct mcp *mcp = platform_get_drvdata(dev);
242 struct mcp_sa11x0 *m = priv(mcp);
243 struct resource *mem0, *mem1;
245 if (m->mccr0 & MCCR0_MCE)
247 "device left active (missing disable call?)\n");
249 mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
250 mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
256 release_mem_region(mem1->start, resource_size(mem1));
257 release_mem_region(mem0->start, resource_size(mem0));
262 #ifdef CONFIG_PM_SLEEP
263 static int mcp_sa11x0_suspend(struct device *dev)
265 struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
267 if (m->mccr0 & MCCR0_MCE)
268 dev_warn(dev, "device left active (missing disable call?)\n");
270 writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));
275 static int mcp_sa11x0_resume(struct device *dev)
277 struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
279 writel_relaxed(m->mccr1, MCCR1(m));
280 writel_relaxed(m->mccr0, MCCR0(m));
286 static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
287 #ifdef CONFIG_PM_SLEEP
288 .suspend = mcp_sa11x0_suspend,
289 .freeze = mcp_sa11x0_suspend,
290 .poweroff = mcp_sa11x0_suspend,
291 .resume_noirq = mcp_sa11x0_resume,
292 .thaw_noirq = mcp_sa11x0_resume,
293 .restore_noirq = mcp_sa11x0_resume,
297 static struct platform_driver mcp_sa11x0_driver = {
298 .probe = mcp_sa11x0_probe,
299 .remove = mcp_sa11x0_remove,
302 .pm = &mcp_sa11x0_pm_ops,
307 * This needs re-working
309 module_platform_driver(mcp_sa11x0_driver);
311 MODULE_ALIAS("platform:" DRIVER_NAME);
312 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
313 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
314 MODULE_LICENSE("GPL");